Research on the Application of Water Inflow Prediction System of Diversion Tunnel in the Secondary Hydropower Station in Jinping

In this paper, the GIS technology is applied to develop the water inflow prediction system of diversion tunnel and achieve the dynamic prediction of water inflow, thus providing technical decision-making for construction safety. The prediction of water inflow utilizes the analytical method and numerical simulation. Conduct the water inflow prediction for the tunnel according to the geological exploration data before the construction, and the obtained results will be saved in the evaluation system as a background database. Then carry out rectification for the parameters of water inflow model combined with the geological information and groundwater information of the tunnel construction, the revised parameters will be used to update the underlying database of water inflow prediction and evaluation, which is regarded as the prediction results of the water inflow of the on-site construction. This system implements the dynamic prediction of tunnel water inflow and its application in diversion tunnel in the secondary hydropower station of Jinping indicates that: it can provide a relatively accurate and intuitive hydro geological basis and engineering technical support for water exploring in safe tunnel excavation.